| Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 1 | /* |
| 2 | * BSG helper library |
| 3 | * |
| 4 | * Copyright (C) 2008 James Smart, Emulex Corporation |
| 5 | * Copyright (C) 2011 Red Hat, Inc. All rights reserved. |
| 6 | * Copyright (C) 2011 Mike Christie |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | */ |
| 23 | #ifndef _BLK_BSG_ |
| 24 | #define _BLK_BSG_ |
| 25 | |
| 26 | #include <linux/blkdev.h> |
| 27 | |
| 28 | struct request; |
| 29 | struct device; |
| 30 | struct scatterlist; |
| 31 | struct request_queue; |
| 32 | |
| 33 | struct bsg_buffer { |
| 34 | unsigned int payload_len; |
| 35 | int sg_cnt; |
| 36 | struct scatterlist *sg_list; |
| 37 | }; |
| 38 | |
| 39 | struct bsg_job { |
| 40 | struct device *dev; |
| 41 | struct request *req; |
| 42 | |
| 43 | /* Transport/driver specific request/reply structs */ |
| 44 | void *request; |
| 45 | void *reply; |
| 46 | |
| 47 | unsigned int request_len; |
| 48 | unsigned int reply_len; |
| 49 | /* |
| 50 | * On entry : reply_len indicates the buffer size allocated for |
| 51 | * the reply. |
| 52 | * |
| 53 | * Upon completion : the message handler must set reply_len |
| 54 | * to indicates the size of the reply to be returned to the |
| 55 | * caller. |
| 56 | */ |
| 57 | |
| 58 | /* DMA payloads for the request/response */ |
| 59 | struct bsg_buffer request_payload; |
| 60 | struct bsg_buffer reply_payload; |
| 61 | |
| 62 | void *dd_data; /* Used for driver-specific storage */ |
| 63 | }; |
| 64 | |
| 65 | void bsg_job_done(struct bsg_job *job, int result, |
| 66 | unsigned int reply_payload_rcv_len); |
| 67 | int bsg_setup_queue(struct device *dev, struct request_queue *q, char *name, |
| 68 | bsg_job_fn *job_fn, int dd_job_size); |
| 69 | void bsg_request_fn(struct request_queue *q); |
| 70 | void bsg_remove_queue(struct request_queue *q); |
| 71 | void bsg_goose_queue(struct request_queue *q); |
| 72 | |
| 73 | #endif |